Motorcycle



FIG. 1 is a front view of a motorcycle incorporating our new design;

FIG. 2 is a back view thereof;

FIG. 3 is a right side elevational view thereof, with the foot brake in extended position;

FIG. 4 is a left side elevational view thereof; and,

FIG. 5 is a top plan view thereof.

The bottom view of the motorcycle incorporating our new design is not shown in the drawings and its ornamental design is not part of the claimed design. 

The ornamental design for a motorcycle, as shown and described. 